Allow for no mix.js() calls at all.

This way, you can do mix.sass() only.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "laravel-mix",
-  "version": "0.5.7",
+  "version": "0.5.8",
   "description": "Laravel Mix is an elegant wrapper around Webpack for the 80% use case.",
   "main": "src/index.js",
   "scripts": {

src/Mix.js

@@ -18,6 +18,7 @@ class Mix {
         this.notifications = true;
         this.cssPreprocessor = false;
         this.versioning = false;
+        this.js = [];
         this.inProduction = process.env.NODE_ENV === 'production';
         this.publicPath = './';
     }
@@ -73,21 +74,19 @@ class Mix {
      * Determine the Webpack entry file(s).
      */
     entry() {
-        if (! this.js) {
-            throw new Error(
-                `Laravel Mix: You must call "mix.js()" once or more.`
-            );
-        }
+        let entry = { 'app': [] };
 
-        let entry = this.js.reduce((result, paths) => {
-            let name = paths.output.pathWithoutExt
-                .replace(this.publicPath, '')
-                .replace(/\\/g, '/');
+        if (this.js.length) {
+            entry = this.js.reduce((result, paths) => {
+                let name = paths.output.pathWithoutExt
+                    .replace(this.publicPath, '')
+                    .replace(/\\/g, '/');
 
-            result[name] = paths.entry.map(src => src.path);
+                result[name] = paths.entry.map(src => src.path);
 
-            return result;
-        }, {});
+                return result;
+            }, {});
+        }
 
         if (this.cssPreprocessor) {
             let stylesheets = this[this.cssPreprocessor].map(entry => entry.src.path);
@@ -96,7 +95,7 @@ class Mix {
             entry[name] = entry[name].concat(stylesheets);
         }
 
-        if (this.js.vendor) {
+        if (this.js.length && this.js.vendor) {
             let vendorPath = (this.js.base + '/vendor').replace(this.publicPath, '');
 
             entry[vendorPath] = this.js.vendor;

test/mix.js

@@ -10,21 +10,12 @@ test.afterEach('cleanup', t => {
 });
 
 
-test('that it throws an exception if mix.js() was not called', t => {
-    let error = t.throws(() => {
+test('that it uses a default entry, if mix.js() is never called', t => {
         mix.sass('sass/stub.scss', 'dist');
-        Mix.entry();
-    }, Error);
 
-    t.is(error.message, 'Laravel Mix: You must call "mix.js()" once or more.');
-
-    mix.reset();
-
-    t.notThrows(() => {
-        mix.js('js/stub.js', 'dist');
-        mix.sass('css/stub.css', 'dist');
-        Mix.entry();
-    }, Error);
+        t.deepEqual({
+            app: [path.resolve('sass/stub.scss')]
+        }, Mix.entry());
 });